Github user kiszk commented on a diff in the pull request: https://github.com/apache/spark/pull/20637#discussion_r212584773 --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionEvalHelper.scala --- @@ -223,8 +223,9 @@ trait ExpressionEvalHelper extends GeneratorDrivenPropertyChecks with PlanTestBa } } else { val lit = InternalRow(expected, expected) + val dtAsNullable = expression.dataType.asNullable --- End diff -- Good question. This change related to the part in the description ``` On the other hand, expected will be converted to UnsafeArrayData(null) considering its value. ``` Since this PR removes nullchecks in the generated code based on DataType of `expression`, `null` in `expected` never converted to `null`. To forcefully insert null check in the generated code to convert `experted` to `UnsafeArrayData`, we need `asNullable`. Does it answer to this question?
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